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1.
Adjective- The person who is responsible of someone's retarded act and or retarded way of saying something.
"Oh man, I totally just slipped on a banana peel Tom threw in front of me."

"LOL Tom is totally the derpetrator of this situation here."

"I hate Tom with a burning passion."
by TheDerpetrator November 17, 2011
 
2.
One who is responsible for committing a stupid act.
One of my roommates left the oven on. Again. Okay, guys... who's the derpetrator here?
by spiffy_kimbean April 19, 2011